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if you have symptoms such as cough, shortness of breath, fever you can get tested. You may or may not be admitted to a hospital.
if you have mild symptoms, even if you get tested and it comes out positive, they are just going to tell you to treat yourself at home.
If you have symptoms then yes so you and others you may live with know to self isolate. If you are unsure and carry on as normal ie shopping etc then you can spread it obviously. Get tested and good luck, I am recovering at the moment.